You are probably really good at it. It's a fascinating drill in that any change in distance between the balls and the firmness of the stroke calls for very precise tip changes on the CB. In the first stage, using a rolling CB, to move the CB 6", 12', 18", etc and a stroke just hard enough is the easiest. Then when we move to a moderate firm stroke for all the distances, the tip must come off the top of the CB and the action is almost all in the middle (as you know).
Have you found your skill in this invaluable in your position play?
The struggle is to make it follow, draw and stop perfectly in line. Really forces the player to hit perfect on the target spot.
It's critical for play. Once a player learns draw and can control it this is the next step if you want to get shape. A player needs to control the stun line. Follow, stop and draw is the way to do that.